Chords, scales, progressions, transposition, and MIDI tools for music theory AI agents.
Quick Install
Automated & IDE SetupCopy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.
One-click editor setup isn’t available for this listing yet — we don’t have a confirmed install command, and we’d rather show nothing than point your editor at the wrong package or host. Follow the project’s own setup instructions, linked above.
Manual Client & Custom JSON ConfigExpand JSON â–¾
No confirmed setup config for this listing yet. We only publish a config block when the install details come from the project itself — its README, its docs, or a verified owner. We haven’t found those for PlayByKey Music Theory, and we’d rather show nothing than a guess you’d paste into your client. Follow the project’s own setup instructions for the current steps.
Documentation Overview
Developer Tools
Packages for PlayByKey - see the table below for what's here.
- npm: npmjs.com/package/@playbykey/theory
- Documentation: theory-engine.docs.playbykey.com - interactive playgrounds
- Changelog: GitHub Releases
Install
Quickstart and API examples: packages/theory/README.md
Why @playbykey/theory
- Foundation music theory engine: music theory as code. Modes, keys, intervals, and scale relationships resolved deterministically; one source of truth every app, notation tool, or AI agent can build on.
- Zero dependencies: no transitive baggage; safe for agents, edge runtimes, and tight bundles
- Strictly typed: every function's types exported alongside it, no
any - Agent-ready: copy-paste LLM context prompt and interactive docs
- Sharps-only notation: one canonical spelling per note (
C#, notDb) keeps theNotetype safe and unambiguous. Flats are fully supported for both input (parseNote/parseNoteTokenacceptDb,Eb,Gb,Ab,Bb) and output (getFlats/getEnharmonicLabels), without extendingNoteitself.
Packages
| Package | Description | Links |
|---|---|---|
@playbykey/theory | Zero-dependency music theory engine - scales, modes, intervals, chords, progressions, key relationships | npm · docs · changelog |
@playbykey/theory-mcp | MCP server that exposes the theory engine as AI-callable tools | npm · README |
theory-docs | Starlight documentation site (private workspace package) | live site · README |
License
MIT for the repository tooling and @playbykey/theory. See LICENSE.
Individual packages may declare their own license in their package.json.
Related MCP Servers
Adoption & maintenance
Factual signals from GitHub, npm, and our automated checks — not a rating.
GitHub stars
1
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Last commit
10d ago
Most recent push to the default branch.
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Frequently Asked Questions about PlayByKey Music Theory
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CategoryDeveloper Tools
10/10 checks healthy over the last 42d
33Quality signal: Emerging · 33/100How this signal is calculated ▾
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Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.
Verified ownership10/20
Documentation & tools11/30
Adoption & activity4/15
Community engagement0/10
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